How to Kill Yourself with an Isolation Transformer

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At certain age mom doesn't have an authority anymore.
One scientist has always wondered how pre-teen boys stay alive.

Internet time is not new anymore, so young adults are net natives.
Maybe it takes few generations.

Maybe arrogance and immortality of young adult mind prevents learning from books forever.
Maybe knowledge of practices just don't materialize without practical experience.

No practice no skill, it's a given.
But a skill of don't do.

[Phil1977]

This only works if source impedances are matched, or at least close enough.

Example: connect the negative to a hot ground and the positive to a 10kΩ voltage divider. Positive rise time for common mode signals increases by 100ns assuming 5pF probe input capacitance, negative remains unaffected.

But it´s still better than just bridging a huge unknown impedance to the negative side as you do by connecting a scope-GND isolated by a mains transformer. There´s no probe on the world that does not influence the circuit where its connected. But you can keep the disturbance low by using the right tools.